I was talking to Kefka in global chat, and he mentioned to bring the topic up here.
Mythics, as we all know, are a very scare and rare creature. Some of the most unique and powerful troops, and the most difficult to get. Pulling a duplicate just feels awful.
My main suggestion is to make it so that the $50 options (Growth Pack II, Path to Glory II, Path to Power II) do not give you a mythic that you already have. I feel like this one is the most important to address, because it does feel really bad to wait 30 days, and have spent the cash (yes, I know you get traitstones in return, but you are also buying a mythic), and get something that you already have. And I’m talking from experience, I only had 1 mythic, and got a duplicate of that mythic through the Growth Pack II. That was terrible letdown, one I still feel regret to this day about.
My second suggestion would be to make it so that when you pull a mythic from Gem, Glory, or Guild keys, that you get something you don’t have. Now, I know this is probably a little more sensitive, but I really think that player happiness would go up if this were implemented. Hearthstone did something similar in their game in that you’ll not pull another duplicate legendary (their highest quality) until you have all the legendaries from that card pack, and community response was overwhelmingly positive.
Another option for duplicate mythics pulled from chests (I still strongly believe that the real money one should not give you a duplicate) is some sort of trade-in system where you can destroy a base-quality mythic into some quantity (1000/2000/3000) of diamonds.
I think that all the players would want something like this, it’s just a matter of whether or not this is financially feasible to the devs / publishers. But I would like to at least have some sort of candid conversation with the powers that be, because I do think this would make the game better.